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Operating Expenses - Components of Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Income and Expenses [Abstract]        
Fixed compensation expense $ 5,922 $ 5,233 $ 18,136 $ 16,556
Variable compensation expense 4,923 6,467 13,655 14,713
Equity compensation expense 3,033 2,337 9,565 7,634
Total compensation expense 13,878 14,037 41,356 38,903
Systems and consulting 1,794 1,856 5,434 5,183
Loan acquisition costs 1,887 1,187 5,860 3,397
Office costs 1,173 988 3,397 3,231
Accounting and legal 1,170 519 3,078 2,322
Corporate costs 462 415 1,462 1,363
Other operating expenses 1,126 920 2,942 2,390
Total Operating Expenses $ 21,490 $ 19,922 $ 63,529 $ 56,789